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2222×17+3333×4+6666×97.68-3.56+2.32-5.441.25×3.2×0.25(0.625×6.8+0.625×4.2-0.625)÷0.625300÷0.125÷0.84000-1-2-3-…-77-78.
题目详情
2222×17+3333×4+6666×9 7.68-3.56+2.32-5.44 1.25×3.2×0.25 (0.625×6.8+0.625×4.2-0.625)÷0.625 300÷0.125÷0.8 4000-1-2-3-…-77-78. |
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答案和解析
(1)2222×17+3333×4+6666×9 =1111×2×17+1111×3×4+1111×6×9, =1111×(2×17+3×4+6×9), =1111×(34+12+54), =1111×100, =111100; (2)7.68-3.56+2.32-5.44 =7.68+2.32-3.56-5.44, =10-(3.56+5.44), =10-9, =1; (3)1.25×3.2×0.25 =1.25×0.8×4×0.25, =(1.25×0.8)×(4×0.25), =1×1, =1; (4)(0.625×6.8+0.625×4.2-0.625)÷0.625 =0.625×6.8÷0.625+0.625×4.2÷0.625-0.625÷0.625, =6.8+4.2-1, =11-1, =10; (5)300÷0.125÷0.8 =300÷(0.125×0.8), =300÷0.1, =3000; (6)4000-1-2-3-…-77-78 =4000-(1+2+3-…+77+78), =4000-(1+40+38×80), =4000-(1+40+3040), =4000-3081, =919. |
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